type IV

type IV
an autosomal recessive disorder with onset in infancy, caused by mutations in the NTRK1 gene (locus: 1q21-q22), which encodes the tyrosine kinase receptor for nerve growth factor. It is characterized by insensitivity to pain, anhidrosis, episodes of fever, self-mutilation, mild mental retardation, emotional lability, and hyperactivity. Small unmyelinated axons are absent or nearly so, the number of myelinated axons is decreased, and sweat gland innervation is absent.

Medical dictionary. 2011.

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